The present disclosure generally relates to methods of preparing nicotine and resolving R,S nicotine to enrich the (S)(−) enantiomer. The method may comprise combining N-methyl-2-pyrrolidone or a salt thereof with a nicotinate compound in the presence of a solvent and a strong base to form 1-methyl-3-nicotinoyl-2-pyrrolidone or a salt thereof; and reducing the 1-methyl-3-nicotinoyl-2-pyrrolidone or salt thereof in solution with Na
2
S
2
O
4
to produce racemic nicotine or salt thereof. Resolving the racemic nicotine (or other enantiomeric mixture) may comprise combining the nicotine with (−)-O,O′-di-p-toluoyl-L-tartaric acid (L-PTTA).
Synthesis of [4-2H2]-, (4R)[4-2H1]- and (4S)[4-2H1]- 4-(methylnitrosamino)-1-(3'-pyridyl)-1-butanone, c-4 deuteriated isotopomers of the procarcinogen nnk
作者:Tanmaya Pathak、Noel F. Thomas、Mahmoud Akhtar、David Gani
DOI:10.1016/s0040-4020(01)81978-5
日期:1990.1
The synthesis of C-4 dideuteriated and both C-4 monodeuteriated enantiomers of NNK, the metabolic precursor to a variety of potential carcinogens, starting from (2S)-glutamic acid and nicotinic acid is described. The route is suitable for the synthesis of NNK isotopomers labelled in each of the putative sites for metabolic activation.
Synthesis of α-Quaternary Bicyclo[1.1.1]pentanes through Synergistic Organophotoredox and Hydrogen Atom Transfer Catalysis
作者:Jeremy Nugent、Alistair J. Sterling、Nils Frank、James J. Mousseau、Edward A. Anderson
DOI:10.1021/acs.orglett.1c03346
日期:2021.11.5
Bicyclo[1.1.1]pentanes (BCPs) are important in drug design as sp3-rich bioisosteres of arenes and tert-butyl groups; however, the preparation of BCPs with adjacent quaternary carbons is barely known. We report a facile synthesis of α-quaternary BCPs using organophotoredox and hydrogen atom transfer catalysis in which α-keto radicals, generated through oxidation of β-ketocarbonyls, undergo efficient
Provided is a process for preparing racemic nicotine from 1-methyl-3-nicotinoyl-2-pyrrolidone or a salt thereof using one-pot process. The process comprises the following steps: 1) in a reaction vessel, reacting 1-methyl-3-nicotinoyl-2-pyrrolidone or a salt thereof in the presence of a suitable solvent and a strong acid by heat; after the reaction is complete, cooling the same and adjusting the pH to 7-8 with alkali; and 2) directly adding a reductant into the above vessel, and after the reaction, purifying the product so as to obtain high purity racemic nicotine or a salt thereof.